Question

Ex 2 va rog mult din suflet (V35) mssssssssss

Answer 1

$\frac{2x-4}{x+1}=\frac{2x+2-6}{x+1}=\frac{2x+2}{x+1}-\frac{6}{x+1}=2-\frac{6}{x+1}$
$2\in\mathbb{Z}\Rightarrow\frac{6}{x+1}\in\mathbb{Z}\Rightarrow x+1\mid6$
$x+1\in\{1,2,3,6,-1,-2,-3,-6\}$
$x\in\{0,1,2,5,-2,-3,-4,-7\}$
$A=\{0,1,2,5,-2,-3,-4,-7\}$
$A\cap N=\{0,1,2,5\}$